Let A B C D be a square with sides of unit length. Points E and F are taken on sides A B and A D,...

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Let A B C D be a square with sides of unit length. Points E and F are taken on sides A B and A D, respectively, so that A E=A F. Letbe a point inside the square A B C D.
The value of (P A)^2-(P B)^2+(P C)^2-(P D)^2 is equal to
(1) 3
(2) 2
(3) 1

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